At the Bronx Latin School in New York City, teacher Katrina Roman says the topic of ancient history doesn't usually set students abuzz. But this week, they took a field trip to ancient Aztec ruins using Google Expeditions, a virtual reality teaching tool built with Google Cardboard. Normally, their assignment would involve poring over photocopied photographs, but instead, they stood at the top of Chichen Itza, then examined detailed carvings at Tenochtitlan....